Packinghan v North Carolina (2017) - Access to social media and digital infrastructure cannot be prohibited by the state.
Marsh v Alabama (1946) - Constitutional protections of 1st and 14th amendments applicable within confines of “town” owned by a private entity.
Packinghan, viewed in combination with Marsh, provides an interesting lens for issues concerning a digit company owned town. If data storage and/or social media can be viewed as critical digital infrastructure and a private organization provides those services, an argument can and will likely be made that the services are tantamount to a digital company owned town.
As Justice Ginsburg said during oral argument regarding private digital networks, “the point is that these people are being cut off from a very large part of the marketplace of ideas. And the First Amendment includes not only the right to speak, but the right to receive information.”
And as Justice Kagan stated during Packinghan oral argument, "whether it’s political community, whether it’s religious community... these sites have become embedded in our culture as ways to communicate and ways to exercise our constitutional rights.”
Moreover, AWS's behavior may be viewed as an antitrust issue, acting in conjunction with a cartel. A party does not need to have majority market share to function in coordination with other dominate players in order to form a cartel that can manipulate the market.
Also, they may or may not have provided sufficient notice (a contract issue).
Either way, it's definitely relevant to industry and likely to be litigated on appeal following the trial court's ruling (whatever it is).